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Forum: Hydroponics 07-07-2012, 10:12 AM
Replies: 12
Views: 13,275
Posted By tandt
When you are talking about PPM. PPM of WHAT........

When you are talking about PPM. PPM of WHAT..... PPM of chlorine , sufer, ect...... I AM NOT UNDERSTANDING> HELP HELP HELP
Forum: Hydroponics 07-07-2012, 10:05 AM
Replies: 12
Views: 13,275
Posted By tandt
WHAT is PPM

when you speak of PPM... PPM of what?:rolleyes:
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